如何利用CSS3动画实现弹跳效果

CSS代码（创建一个与html同目录的index.css文件）

#ballWrapper{position:fixed;top:35%;left:50%;z-index:100;margin-left:-70px;width:140px;height:300px;cursor:pointer;-webkit-transition:all 5s linear 0s;-moz-transition:all 5s linear 0s;transition:all 5s linear 0s;-webkit-transform:scale(1);-moz-transform:scale(1);-o-transform:scale(1);transform:scale(1);-ms-transform:scale(1)}
#ballWrapper:active{cursor:pointer;-webkit-transform:scale(0);-moz-transform:scale(0);-o-transform:scale(0);transform:scale(0);-ms-transform:scale(0)}
#ball{position:absolute;top:0;z-index:11;width:140px;height:140px;border-radius:70px;background:#bbb;background:url(data:image/svg+xml; background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(187,187,187,1)), color-stop(99%,rgba(119,119,119,1))); background: -webkit-linear-gradient(top, rgba(187,187,187,1) 0%,rgba(119,119,119,1) 99%); background: -o-linear-gradient(top, rgba(187,187,187,1) 0%,rgba(119,119,119,1) 99%); background: -ms-linear-gradient(top, rgba(187,187,187,1) 0%,rgba(119,119,119,1) 99%); background: linear-gradient(top, rgba(187,187,187,1) 0%,rgba(119,119,119,1) 99%); box-shadow: inset 0 -5px 15px rgba(255,255,255,0.4), inset -2px -1px 40px rgba(0,0,0,0.4), 0 0 1px #000; cursor: pointer; base64,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);background:-moz-linear-gradient(top,rgba(187,187,187,1) 0,rgba(119,119,119,1) 99%);filter:progid:DXImageTransform.Microsoft.gradient( startColorstr='#bbbbbb', endColorstr='#777777', GradientType=0 );-webkit-animation:jump 1s infinite;-moz-animation:jump 1s infinite;-o-animation:jump 1s infinite;-ms-animation:jump 1s infinite;animation:jump 1s infinite}
#ball::after{position:absolute;top:10px;left:30px;z-index:10;width:80px;height:40px;border-radius:40px/20px;background:url(data:image/svg+xml; background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(232,232,232,1)), color-stop(1%,rgba(232,232,232,1)), color-stop(100%,rgba(255,255,255,0))); background: -webkit-linear-gradient(top, rgba(232,232,232,1) 0%,rgba(232,232,232,1) 1%,rgba(255,255,255,0) 100%); background: -o-linear-gradient(top, rgba(232,232,232,1) 0%,rgba(232,232,232,1) 1%,rgba(255,255,255,0) 100%); background: -ms-linear-gradient(top, rgba(232,232,232,1) 0%,rgba(232,232,232,1) 1%,rgba(255,255,255,0) 100%); background: linear-gradient(top, rgba(232,232,232,1) 0%,rgba(232,232,232,1) 1%,rgba(255,255,255,0) 100%); content: ""; base64,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);background:-moz-linear-gradient(top,rgba(232,232,232,1) 0,rgba(232,232,232,1) 1%,rgba(255,255,255,0) 100%);filter:progid:DXImageTransform.Microsoft.gradient( startColorstr='#e8e8e8', endColorstr='#00ffffff', GradientType=0 )}
#ballShadow{position:absolute;bottom:0;left:50%;z-index:10;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-webkit-transform:scaleY(.3);-moz-transform:scaleY(.3);-o-transform:scaleY(.3);transform:scaleY(.3);-ms-transform:scaleY(.3);-webkit-animation:shrink 1s infinite;-moz-animation:shrink 1s infinite;-o-animation:shrink 1s infinite;-ms-animation:shrink 1s infinite;animation:shrink 1s infinite}
@-webkit-keyframes jump{0%{top:0;-webkit-animation-timing-function:ease-in}
50%{top:140px;height:140px;-webkit-animation-timing-function:ease-out}
55%{top:160px;height:120px;border-radius:70px/60px;-webkit-animation-timing-function:ease-in}
65%{top:120px;height:140px;border-radius:70px;-webkit-animation-timing-function:ease-out}
95%{top:0;-webkit-animation-timing-function:ease-in}
100%{top:0;-webkit-animation-timing-function:ease-in}
}
@-moz-keyframes jump{0%{top:0;-moz-animation-timing-function:ease-in}
50%{top:140px;height:140px;-moz-animation-timing-function:ease-out}
55%{top:160px;height:120px;border-radius:70px/60px;-moz-animation-timing-function:ease-in}
65%{top:120px;height:140px;border-radius:70px;-moz-animation-timing-function:ease-out}
95%{top:0;-moz-animation-timing-function:ease-in}
100%{top:0;-moz-animation-timing-function:ease-in}
}
@-o-keyframes jump{0%{top:0;-o-animation-timing-function:ease-in}
50%{top:140px;height:140px;-o-animation-timing-function:ease-out}
55%{top:160px;height:120px;border-radius:70px/60px;-o-animation-timing-function:ease-in}
65%{top:120px;height:140px;border-radius:70px;-o-animation-timing-function:ease-out}
95%{top:0;-o-animation-timing-function:ease-in}
100%{top:0;-o-animation-timing-function:ease-in}
}
@-ms-keyframes jump{0%{top:0;-ms-animation-timing-function:ease-in}
50%{top:140px;height:140px;-ms-animation-timing-function:ease-out}
55%{top:160px;height:120px;border-radius:70px/60px;-ms-animation-timing-function:ease-in}
65%{top:120px;height:140px;border-radius:70px;-ms-animation-timing-function:ease-out}
95%{top:0;-ms-animation-timing-function:ease-in}
100%{top:0;-ms-animation-timing-function:ease-in}
}
@keyframes jump{0%{top:0;animation-timing-function:ease-in}
50%{top:140px;height:140px;animation-timing-function:ease-out}
55%{top:160px;height:120px;border-radius:70px/60px;animation-timing-function:ease-in}
65%{top:120px;height:140px;border-radius:70px;animation-timing-function:ease-out}
95%{top:0;animation-timing-function:ease-in}
100%{top:0;animation-timing-function:ease-in}
}
@-webkit-keyframes shrink{0%{bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-webkit-animation-timing-function:ease-in}
50%{bottom:30px;margin-left:-10px;width:20px;height:5px;border-radius:20px;background:rgba(20,20,20,.3);box-shadow:0 0 20px 35px rgba(20,20,20,.3);-webkit-animation-timing-function:ease-out}
100%{bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-webkit-animation-timing-function:ease-in}
}
@-moz-keyframes shrink{0%{bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-moz-animation-timing-function:ease-in}
50%{bottom:30px;margin-left:-10px;width:20px;height:5px;border-radius:20px;background:rgba(20,20,20,.3);box-shadow:0 0 20px 35px rgba(20,20,20,.3);-moz-animation-timing-function:ease-out}
100%{bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-moz-animation-timing-function:ease-in}
}
@-o-keyframes shrink{0%{bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-o-animation-timing-function:ease-in}
50%{bottom:30px;margin-left:-10px;width:20px;height:5px;border-radius:20px;background:rgba(20,20,20,.3);box-shadow:0 0 20px 35px rgba(20,20,20,.3);-o-animation-timing-function:ease-out}
100%{bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-o-animation-timing-function:ease-in}
}
@-ms-keyframes shrink{0%{bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-ms-animation-timing-function:ease-in}
50%{bottom:30px;margin-left:-10px;width:20px;height:5px;border-radius:20px;background:rgba(20,20,20,.3);box-shadow:0 0 20px 35px rgba(20,20,20,.3);-ms-animation-timing-function:ease-out}
100%{bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);-ms-animation-timing-function:ease-in}
}
@keyframes shrink{0%{bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);animation-timing-function:ease-in}
50%{bottom:30px;margin-left:-10px;width:20px;height:5px;border-radius:20px;background:rgba(20,20,20,.3);box-shadow:0 0 20px 35px rgba(20,20,20,.3);animation-timing-function:ease-out}
100%{bottom:0;margin-left:-30px;width:60px;height:75px;border-radius:30px/40px;background:rgba(20,20,20,.1);box-shadow:0 0 20px 35px rgba(20,20,20,.1);animation-timing-function:ease-in}
}